I have a job that I need to open up existing polygon holes. This process needs to be done on parts that were send to me as a STP. file which means the tree is no longer associated with it. Other than sketching construction lines to enable me to get the center of the existing polygon does anyone know of a better/faster procedure? The customer is requiring multiple riv nuts but did not use the correct polygon hole size. This will need to be done on hundreds of polygon holes so I am just looking for the most effective way to do it.